Of particular note here, is the Navionics Charting app. They released a new version today that not only supports the iPad but added a really cool feature for all users. You can now turn on Google Maps overlays. You can choose from Map, Satelite, or hybrid. The app puts in the Google map data in for the land area and uses the Navionics vector chart data for the water area. Some very high end chartplotters do this, but to have it in your hand on you phone or iPod is really cool. For $9.99 this app is the deal of the century in the Navigation charting world. To get the app and your choice of a huge Navionics Gold chart region for this price is amazing.
The app also has the best tides and currents info I have found yet in an iPod app with a very intuitive display. They include a large number of stations scattered all over the region you choose.

Most of the other apps that pushed out today also said they were updating to a universal app with new features and screen layouts that support the bigger iPad screen as well without pixel doubling.
